Felt for use on the drying portion of paper and pasteboard machines



PatentedyFeb. 23, 1926'.

UNITED STATES,

PATENT OFFICE.

EDUARD v. Aswan, or norms, BELGIUM.

FELT r03. use on THE minus PORTION or rArER .mn rAs'rEBoAnn maonmns.

Ho Drawing.

To all whom it may concern:

Be it known that I, EoUAm) v. As'rnN, a subject of the King of Belgium, residing at Eupen, No. Hillstrasse, Belgium, have inl vented certain new and useful Improvements in Felts for Use on the Drying Portion. of Paper and Pasteboard Machines; and I do hereby declare the following to be a full,

clear, and exact description of the invention,

1 such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to felts designed to be used on the drying portion of paper and paste-board 'machines, and it has more particularly reference to felts of this kind consisting of a fabric made of asbestos and animal or Vegetable textile fibres or the like.

The advantageous properties of the asbestos for such felts reside in its resistibility against heat and moisture and in itsabsorptive force,

which means its ability of extracting moisture from the wet-paper web under treatment.

However, the asbestos-felts known hitherto possess the drawback that the other textile fibres used in combination with the asbestosfibres are not protected against the heat of the drying portion of the machine and the moisture of the paper web and since vegetable textile fibres are easily affected and damaged by heat and moisture, the wellknown drying" felts have only a comparatively short life.

The present invention has for its object to provide a drying felt which is soft and pliable and in which the animal and vegetable fibres are safely protected against the injurious influence of the heat and moisture,

thereby rendering the felt durable. I

This object is attained according to the invention by making the felt of threads consisting of a core of cotton, linen or the like, and of, an envelope of asbestos densely woven or spun around the core.

W'ith fabrics made of threads in accordance with the invention, the textile core is Application filed Apr! 30, 1924. Seria1 No. 7 10,187.

perfectly protected and insulated against the heat by the asbestos envelope. The asbestos forms the outer surface of all threads throughout the entire fabric while the other textile fibres are fully enveloped. The felt thus retains the character ofa pure asbestosfabric, and the absorptive force of the as bestos is fullymaintained.

The above-mentioned properties of the as bestos-fibres are based on the fact that they are of a very brittle character. In an asbestos-thread the fibres are not more or less parallel with relation to one another as. in other textile threads. asbestos-fibres lie pell-mell; they are of an extreme fineness and form a thread with many small hollow spaces or pores. Such a thread is adapted to absorb moisture readily and to be as readily dried owing to its porosity, since its ability of absorbing moisture is only based on the capillarity of the structure of the thread, while the mineral asbestos-fibres themselves remain always dry. Therefore, felts made in accordance with On the contrary, the

the invention are not affected by the heat of the drying cylinders, they absorb the water from the paper web and allow the moist vapors to pass through the fabric. Besides,

the new felts remain always soft and pliable so that they will run smoothly and easily a over the guide rolls.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

- A drier felt having a surface section made I up of threads, each having an inner strengthening core of vegetable textile fiber and an outer denseenvelope of asbestos fibers, the asbestos fibers providing an envelope for the core to protect the same, whereby to provide a drier. feltwhich is of requisite tensile strength, of heat resistive quality, and of maximum absorptive function.

In testimony whereof I have signed my name to this specification.

EDUARD v. ASTEN. 

